Water-tube boiler.



N0.857,01 6. PATENTED JUNE 18, 1907.

J. E. BELL.

WATER TUBE BOILER.

APPI-IOATION rmm MAY 21. 1906.

I WITNESS-ES Y .INVZLZR n4: NORRIS Fsrxns cm. WASHINGION, a c.

JOHN BELL, or NEW YORK, N. OOMPANY, OF NEW YORK, N.

Y., ASSIGNOR TO THE BABCOCK & WILCOX Y., A CORPORATION OF NEW JERSEY.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented June 18, 1907.

Application filed irlay 21,1906. Serial No. 817,854.

To (LZZ whom it Tiuty concern.-

Be it known that I, JOHN E. BELL, of New York, county and State of New York, have invented a new and useful \Vater-Tube Boiler, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in which- The figure is a sectional side elevation of a boiler constructed in accordance with my invention.

My invention relates to that class of water tube boilers, wherein transverse upper steam and water drums are connected by banks of tubes to a lower transverse ,mud drum or drums, the source of heat being in .front of the front bank, and the gases flowing in successive up and down passes across successive banks.

The object of the invention is to provide a simple and efficient system for adding heat ing surface between the banks of tubes, especially where two banks are employed.

In the drawings, 2 and 3 represent two upper steam and water drums, and 4 and 5 represent corresponding mud drums. These drums are connected by the banks of tubes 6 and 7 and also by the two rows of baffle tubes 8 and 9 which extend upwardly on either side of the baffle wall 10. The tubes 8 and 9 are preferably curved at their lower ends to enter the mud drum on each side of the pier or wall 11 supporting the baffle. The upper ends of tubes 8 and 9 enter a water chamber or chambers 12 which extends transversely between the banks of water tubes, and is in the upper part of the boiler and above the top of the baffle 10. The wa ter chamber 12 is preferably connected with both steam and water drums by tubes or nippics 13 and 14.

15 represents the furnace from which the gases rise among the first bank and pass over the top of baffle 10 and descend among the tubes of ,the rear bank. The baffle is prefer; ably provided with shelves 16 which tend to hold the gases in the main banks and shield the baffle tubes 8 and 9 so as to make them relatively cooler than the tubes of the adja cent main banks.

In the operation of the boiler the gases rise among the tubes of the front bank and heat the tubes 8 to some extent, and then descend among the tubes of the rear bank to the outlet llue 17 while heating the tubes 9 to some extent. The circulations are probably as follows: Up through the front bank 6 and down through the nipples 13 into chamber 12; also up through the rear bank. 7 and down through nipples 14 into chamber 12. The water of chamber 12 will pass down through the two rows of tubes and be directed into both mud drums. The circulations therefore are probably in the nature of two cycles which commingle in the drum or chamber 12 above the top of the baffle.

The advantages of my invention result from the simple, cheap and ellicicnt manner of adding heating surface between the banks and from the peculiar connections and circulations for such added surface.

The water spaces of the steam and water drums may be provided with direct connecting or circulating tubes, nipples or pipes may be used to directly connect the mud drums, the pipes 14v may be omitted straight or curved tubes may be used in the main banks, the chamber 12 may be in the form of a drum, a long header or a series of short headers, a single mud drum may be used with either one or two compartments, and many other changes may be made without departing from my invention.

I claim 1. A Water tube boiler having upper transverse steam and water drums, each connected by a bank of tubes to a lower transverse mud drum, a water chamber in the upper part of the boiler between the main banks of tubes and connected to the water space of at least one of the steam and water drums, rows of tubes leading downwardly from the water chamber and connecting it directly to the mud drums, and a baffle extending between the latter tubes and terminating below the water chamber; substantially as described.

2. A water tube boiler having two trans verse steamand water drums each. connected by a bank of tubes to a transverse mud drum, a transverse water chamber extending between the banks of tubes in the upper part of the boiler and connected to the water spaces of both steam and water drums, and tubes leading downwardly from said water chamher and connecting directly into both mud drums; substantially as described.

3. A water tube boiler having two transverse steam and water drums each connected by a bank of tubes to a transverse mud drum, drum, a transverse water chamber extending I 5 a transverse water chamber extending bebetween the banks of tubes in the upper part tween the banks of tubes in the upper part of of the boiler, and connected to the Water the boiler and connected to the water spaces K space of one of the steam and water drums,

5 of both steam and water drums, and tubes and tubes leading downwardly from said Waleading downwardly from said water chamter chamber, and connecting directly into 20 her and connecting directly into both mud both mud drums; substantially as described. drums, and a baffle extending upwardly be I In testimony whereof, I have 'hereunto set tween the latter tubes and terminatmg below my hand.

I bgiater chamber; substantially as de- N E. L.

4. A water tube boiler having upper trans- Witnesses:

verse steam and water drums, each connecta G. K. WANNEMAOHER, ed by a bank of tubes to a transverse mud CHAS. B. KNUDsoN. 

